Methanol Immersion Testing
Test Conditions
Five elastomer grades; A90H, G92E, V91K, V91A and Z95X were tested in 100% methanol.
The test used BS1806-312 size O-rings. Test conditions were room temperature for 168 hours, with sampling intervals at 24hrs and 72hrs.
Test Procedure
- Specimens of each material were immersed in methanol liquid under ambient conditions.
- Volume was measured as per ASTM D297, and hardness as per ASTM D1414/1415; before immersion, at each interval and after 7 days immersion.
- Hardness change in points and volume change in percent was calculated as per ASTM D471.
| Property | Time (Days) | A90H | G92E | V91K | V91A | Z95X |
| Hardness Point Change IRHD | 1 | -2 | -1 | -35 | -18 | -9 |
| 3 | -3 | 0 | -30 | -18 | -10 | |
| 7 | -3 | -1 | -26 | -18 | -9.5 | |
| Volume Swell % | 1 | 2 | 1 | 49 | 5 | 6 |
| 3 | 3 | 2 | 79 | 7 | 11 | |
| 7 | 1 | 0 | 64 | 7 | 10 |
